EJB-QL IN where query

DrRakha

Following code use EJB QL to select a group a topics by list of dates .

Using the entity manager

Code:

List<Topic> results = entitymanager.createQuery(  
    "select t from Topic t where t.creationDate in (:datesList)")  
    .setParameter("datesList", datesList)  
    .getResultList(); 

You can put this query in orm.xml as named query :

Code:

<?xml version="1.0" encoding="UTF-8"?>
<entity-mappings version="1.0"
    xmlns="http://java.sun.com/xml/ns/persistence/orm" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_1_0.xsd">

    <named-query name="getTopicsFromList">
        <query>select t from Topic t where t.creationDate in (:datesList)</query>
    </named-query>
</entity-mappings>

In this case you will need to call entitymanager create name query function :

Code:

 
public List<Topic> getTopicsFromDates(List<Date> dateList) {
    List<Topic> topicList = null; 
    javax.persistence.Query query;
    try {
      query = entitymanager.createNamedQuery("getTopicsFromList"); 
      query.setParameter("datesList", dateList)  ;
      topicList  = query.getResultList();
 
            } catch (Exception exception) {
           exception.printStackTrace();
             }
        return topicList ;
}
 

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EJB-QL IN where query

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